add changelog

Author: cometkim

CHANGELOG.md

@@ -27,6 +27,7 @@
 
 - Replace ~date with ~day in Date.make\*. https://github.com/rescript-lang/rescript/pull/7324
 - Remove `-bs-jsx-mode`. https://github.com/rescript-lang/rescript/pull/7327
+- Make the output of integer multiplication consistent with other operations. https://github.com/rescript-lang/rescript/pull/7358
 
 #### :house: Internal